EPRO PR6426/010-110 + CON021/916-240 – Eddy Current Proximity Sensor System | EPRO Monitoring Platform
Engineering Background
EPRO (now part of Emerson Automation Solutions) is a globally recognized manufacturer of machine protection and condition monitoring instrumentation. The PR6426 series eddy current proximity transducer, paired with the CON021 signal conditioning converter, forms a complete non-contact displacement measurement chain widely deployed in turbomachinery, compressor trains, and critical rotating equipment worldwide.
Product Positioning
The PR6426/010-110 + CON021/916-240 system is engineered for procurement engineers and reliability teams requiring a certified, drop-in replacement or new-installation eddy current sensor assembly. It delivers sub-micron resolution displacement measurement with the signal integrity demanded by API 670-compliant machinery protection systems.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | EPRO (Emerson) |
| Sensor Model | PR6426/010-110 |
| Converter Model | CON021/916-240 |
| Measurement Principle | Eddy Current (Non-contact) |
| Probe Tip Diameter | Ø 8 mm |
| Cable Length | 1.0 m (extension cable configurable) |
| Linear Range | 0.25 – 2.25 mm (nominal) |
| Sensitivity | 8 V/mm (nominal) |
| Output Signal | –24 VDC proportional (CON021 conditioned) |
| Supply Voltage | –24 VDC (via CON021) |
| Frequency Response | DC – 10 kHz (–3 dB) |
| Operating Temperature | –40 °C to +120 °C (probe); –40 °C to +85 °C (converter) |
| Target Material | Steel (AISI 4140 reference); correction factors for other alloys |
| Protection Rating | IP67 (probe assembly) |
| Compliance | API 670, CE, ATEX (consult datasheet for zone classification) |
| Country of Origin | Germany |
| Weight | Approx. 250 g (probe + cable assembly) |
Proven Application Environments
- Steam and gas turbine shaft radial/axial displacement monitoring
- Centrifugal and reciprocating compressor rotor position measurement
- Pump and motor bearing clearance surveillance
- Gearbox and expander differential expansion monitoring
- API 670 machinery protection systems (MPS) integration
- Condition-based maintenance (CBM) and predictive maintenance platforms
Engineering Advantages
- Non-contact measurement – zero mechanical wear, suitable for continuous 24/7 operation
- High bandwidth – DC to 10 kHz response captures both static position and dynamic vibration events
- Matched system calibration – PR6426 probe and CON021 converter are factory-calibrated as a matched pair for traceable accuracy
- Robust construction – IP67-rated probe withstands oil mist, coolant splash, and high-humidity environments
- API 670 compliant – direct integration with Bently Nevada, EPRO MMS6000, and third-party protection relay systems
- Wide temperature range – qualified for both cryogenic and high-temperature process environments
System Architecture & Signal Flow
The PR6426/010-110 probe generates a high-frequency oscillator signal that interacts with the conductive target surface. The resulting impedance change is demodulated by the CON021/916-240 signal conditioner into a DC voltage proportional to the gap distance. This conditioned output feeds directly into protection relay input cards or DCS/PLC analog input modules (4–20 mA or voltage, depending on system configuration).
[PR6426 Probe] ──(coaxial cable)──> [CON021 Converter] ──(–24V DC output)──> [Protection Relay / DCS AI Card]
Sourcing & Quality Verification
- All units sourced through authorized distribution channels or verified surplus with full traceability documentation
- Pre-shipment inspection: visual, dimensional, and functional verification against EPRO factory test criteria
- Original manufacturer packaging and labeling preserved where available
- Certificate of Conformance (CoC) and test reports available upon request
- Anti-counterfeit verification: serial number cross-referenced against EPRO/Emerson records
Procurement Process
- Submit RFQ via konmask.com/pages/contact or email support@konmask.com
- Receive formal quotation with lead time, CoC availability, and shipping options within 24 hours
- Confirm purchase order – we accept T/T, L/C, and major corporate procurement platforms
- Shipment via DHL Express, FedEx, or sea freight with full export documentation (commercial invoice, packing list, CO)
- Post-delivery technical support available from our engineering team
Technical FAQ
Q: Can the PR6426/010-110 be used with a Bently Nevada 3300 series monitor?
A: Yes, with appropriate signal conditioning. The CON021 output is compatible with most –24 VDC input protection systems. Verify input impedance and scaling with your system integrator.
Q: What is the difference between PR6426/010-110 and PR6426/010-100?
A: The suffix denotes cable length and connector configuration. /010-110 specifies a 1.0 m armored cable with standard EPRO connector. Confirm your installation geometry before ordering.
Q: Is calibration required after installation?
A: The matched PR6426 + CON021 pair is factory-calibrated. Field gap setting per EPRO installation manual is required; full recalibration is not necessary unless the probe or converter is replaced individually.
Q: Do you provide ATEX-certified units?
A: ATEX-certified variants are available. Please specify zone classification and gas group in your RFQ.
Q: What is the typical lead time?
A: In-stock units ship within 3–5 business days. For sourced units, lead time is 2–4 weeks depending on availability.
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